Reversible toothed gearing for locomotives



April 20, 1926'. 1,581,276 F. LJUNGSTROM REVERSIBLE TOOTHED GEARING FOR LOCOMOTIVES Filed August 1922 5 Sheets-Sheet 1 April 20 192e.

1,581,276 F. LJ UNGSTRUM REVERSIBLE TOOTHED GEARING FOR LOCOMOTIVES Filed August 1922 5 Sheets-Sheet 2 April I 20 F LJUNGSTRGM REVERSIBLE TOOTHED GEARING FOR LOCOMOTIVES Filed August 5,. 1922' 5 Sheets-Sheet 5 April 20,1926. I 1,581,276.

F. LJUNGSTROM.

REVERSIBLE TOOTHED GEIARIINGIFOR nocomow'xyas Fil'ed August 5} 1922' E-Sheets-Sheet 4 April 20 1926. 1.581,276

F. LJUNGSTROM REVERSIBLE TOOTHED GEARING FOR LOCOMOTIVES Filed August 3, 1922 5 Sheets-Sheet 5 Patented Apr. 20, 1926.

en ree. er-ares" PATENT .GFFlCEZ.,,

rnn mrn L Unes TnoM, or LIDINGO-BREVIK, swnnniv, Assr'eNoR T0 K IEBOLAG T v LJUNesrRoMs ANGTURBIN, or STCCKEOLM, SWEDEN, A CORPORATION.

REVERSIBLE TOQTHED GEABING FGR LQCQMOTIVES.

Application filed August a, 1922. sena1 mq579,549.

Lidingo-lirerik, F .edcn, haveini'ented certain new and useful improvements in Re versible Toothed Gearing for Locomotives,

of which the following is a specification.

In locomotives it has been previously suggested to provide a mechanical power trans- :nrting inechanisni between the driving Q11. gin-e and the dr- 1g wheels, and in the case or the driving eng it is well known that this mechanical power transinitting mechanism comprises. spur wheels. Because of the load gauge limiting in each separate case the extension of the I toothed gearing particularly in later 1 direction and consequently in axial direction, it has proved dn'n'cult to so construct the toothed gearing that the reversing may be effected by inserting an extra toothed wheel adapted for backward running. it has previously been suggested to insert such an extra reversing wheel between two other radially displaceable wheels which may be moved radially apart by one 'of the wheels being supported by a frame work adapted to be raised and lowered about a point situated outside the toothed gearing. This reversing device is particularly suited to toothed gearings from which the movement is transmitted to the drivin wheels throu 'h cou lin b i P3 23,

rods, the lay shaft possibly existing in such case being adapted to be raised and lowered.

This invention relates to a reversing device which may be used also in toothed gearings of the type in which the movement is transmitted from the toothed gearing to a pair of driving wheels without the use of coupling rods. he invention relates more particularly to a reversing d vice in tooth-ed g .igs appertaining to locomotives and containing spur wheels and consists chiefly in two shafts movable radially and journaled ecccntrically, one of said shafts supporting one or more extra toothed wheels intended for backward running, the other shaft supporting one or more toothed wheels intended for forward running, all of said toothed wheels being brought, upon the radial adjustment of the shafts, into or out of engagement witheach other and with one or more other toothed wheels in the-toothed gearing.

Two embodiments of the invention are il ine consisting ofa turbine.

hlgs. '1; 2 and' are a verticalsection,as e view and, a horizontal section respectively of an emboclinientof the toothed gearing, 1 showing ain Fig. 2 and Fig. 3 section on the line E.E in 2. Figs. 4, 5 and ('3 show similar'views of another einbotiinent, F l

section on the line AB-'C lust *atedin the accompanying drawings.

shows a section on iin-e'F-Gri in l ioz' and 6 a section on line Kl in Fig.

Refer lng tothe drawings, l designates the driving engine which int-his case is a turbine actuating by lneansof its shaft 2 and "the toothed wheels secured to the same, the toothed wheels 5 secured to a shaft 5. ltlounted on the shaft 5 are also toothed wheels 7 actuating the toothed wheels 8 attached to another shaft 9. By the toothed wheels 10 secured to the shaft 9, said wheels being a little smaller than the toothed wheels 8,- the inovenient is transmitted through the toothed wheel 1i and the diaphragins 13 in well-known-rn ann r to the driving shaft 3 and, if desired, from the latter by means of couphngrod-s 14 to other after the toothed wheels 10 and 11 by radial displacement of the shaft?) are brought outof engagement with eachother, to be thrown in between the toothed wheels 8 and 11. The toothed wheels 17 and 18 are secured toa shaft 19 which isjournaled eccentrically by'means of the eccentric 20, said wheels being adapted to be brought into engagement with the toothed wheels 11 and 8 by the center of the shaft 19 having been moved from the position designated by 21 to the position designated by 22. The shaft9 to which the toothed-wheels 8 and 10 are secured is journaled eccentrically by means of the eccentric 23 in such manner that the center of the shaft' may be displaced from. the position 24: to the position 25 in which latter the toothed wheels 10 and 11 are brought out of engagement with each other. Sincethe positions 24 and 25 are at equal distance from the center 26 of the shaft 5, the toothed wheels 8 and 7 remain always in engagement with each other. The radial movement of the shaft 9 is effected by means of the eccentric 23, the lever 27 being reversed to such a position that the center of the shaft 9 corresponds to the position By reversing the lever 28 the shaft 19 is then displaced to the position 22 and on account thereof the toothed Wheel 8 brought into engagement with the toothed wheel 18 and the toothed wheel 17 into engagement with the toothed wheel 11. Thus the driving wheel shaft 3 is caused to run backwards in relation to the direction of movement obtained by the movement being transmitted directly from the toothed wheel to the toothed wheel 11.

In the embodiment shown in Figs. 4: to 6 the reversing device is located in another place of the gearing than that described above. According to the invention the shaft 5 is so j'ournaled by means of the eccentric 30 that the shaft may be moved radially from the position 31 to the position 32, the extra toothed wheel 33 intended for backward running and secured to shaft 41 be ing adapted by means of the eccentric 35 to be moved from the position 36 to the position 37 by raising or lowering the levers 39 and 40 respectively. As the positions 31 and32 are at equal distance from the center 38 of the turbine shaft 2, the toothed wheels 4; and 6 are always in engagement with each other during this movement. If the shaft 5 be moved from the position 31 to the position 32, the toothed wheels 7 and 8 are brought out of engagement with each other, and the extra toothed wheel 33 intended for backward running is then, by reversing the lever 39, moved from the position 37 to the position 36 and thrown in between the toothed wheels 7 and 8. In this case only one reversing wheel is needed, which wheel, if the gearing contains spiral cut toothed wheels, has to be provided with teeth crossing each other in well-known manner.

By the aid of a reversing device constructed according to the invention back ward running may be effected by throwing in or out toothed wheels having the least possible movement, which is necessary in case of large toothed gearings in which the operation is effected by means of oil under pressure, the difierent levers being connected with oil cylinders. As in many cases the reversing of the direction of movement has to be affected very rapidly, a great accuracy is necessary in such an operation by means of oil, such accuracy being most readily obtained by small movements of the movable parts, while at the same time a great consumption of oil does not jeopardize the high pressure on the oil necessary in each separate case.

What I claim as new and desire to secure by the Letters Patent of the United States is 1. In a reversible gearing for locomotives in combination, a driving shaft, a driven shaft and an intermediate shaft, a pair of eccentrically mounted additional intermediate shafts, pairs of spiral cut gears on each of said shafts and arranged to mesh with correspondingly cut gears on the adjacent shafts, means for moving one of the eccentrically mounted shafts radially to establish a forward motion and a three stage reduc tion, means for moving the other eccentrically mounted intermediate shaft subse quent to disengaging of the first mentiones eecentrically mounted shaft from one of the first mentioned shafts so that the second mentioned eccentric shaft will engage the first mentioned eccentrically mounted shaft and the shaft from which the first eccentrically mounted shaft has previously been disengaged to effect reversible movement of the gearing. 4

2. A reversible gearing as claimed in claim 1, wherein two pairs of gear wheels are mounted on the eccentrically mounted and radially movable shafts and on two of the three first mentioned shafts and are provided with oppositely inclined spiral cut teeth, one pair of said gear wheels on the forward running eccentrically mounted shaft being in engagement with the only pair of gear wheels on the remaining first mentioned shaft du 'ing forward running while on reversing theother pair of gear wheels on the same shaft is engaged with a corresponding pair of ear wheels on the second mentioned eccentrically mounted shaft, and the remaining pair of gear wheels on the second mentioned eccentrically mounted shaft are engaged with the same single pair of gears of the said first mentioned shaft during the said reverse move ment of the gearing.

In testimony whereof I affix my signature.

FREDRIK LJUNG "FROM. 

